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The system of mobile telephony is based on the principle of subdividing the territory - that may be covered by more network operators - in elementary service areas, called cells, each served by a base radio station. The radio mobile terminal that allows users to connect to the network and make their calls, is made of a main terminal (the so called mobile telephone) and a microprocessor electronic module, called SIM card (subscriber identity module). When you call a user who is out of the area covered by your operator, that user is roaming with another operator.

Telephone-photo-Marconis galaxy

In a mobile telecommunication network, also called cellular network, signals are irradiated by several fixed antennas located on the territory, one for each cell (here comes the name). Every antenna transmits on a different channel in order to avoid interferences.

(source: Treccani.it)


see also Cellular Telephony in the Learn & Teach section


Marshall McLuhanmcluhan

Print tore man out of his traditional cultural matrix while showing him how to pile individual upon individual into a massive agglomeration of national and industrial power, and the typographic trance of the West has endured until today, when the electronic media are at last demesmerizing us. The Gutenberg Galaxy is being eclipsed by the constellation of Marconi.


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